SPDZ1 RF V3 Big Tube 4-1 B-Series Swap Header – B16 / B18 / B20 – Fits EG, EK, DC2 & Chassis-Swapped Vehicles

Serious flow. Serious gains. Serious quality.

The SPDZ1 RF V3 Big Tube 4-1 Header is engineered for performance-driven Honda enthusiasts running a B-Series engine swap. Designed to outperform stock manifolds and cheaply made alternatives, this header unleashes real horsepower, offers clearance for A/C and power steering, and fits like a glove in your EG, EK, or DC2 chassis.

Whether you’re building a street sleeper or a track weapon, the SPDZ1 RF V3 brings race-inspired flow, premium build quality, and unmatched reliability — all backed by better flanges, stronger hardware, and superior packaging for peace of mind from checkout to install.

Key Features:

• True 4-1 Big Tube Design: Built for mid-to-high RPM power, offering +10 WHP gains even on stock GSR motors — more with tuning and bolt-ons.
• Full A/C & Power Steering Clearance: No compromises — run full accessories with zero interference.
• 18-Gauge 304 Stainless Steel: TIG welded, corrosion-resistant, and built to withstand daily driving or track abuse.
• Thick CNC Machined Flanges: Heavy-duty flanges machined to spec and thicker than competitors for a warp-resistant seal.
• True 2.5” Collector: For maximum exhaust flow and seamless integration with aftermarket exhaust systems.
• Complete Hardware & Gasket Kit: Comes with everything you need for a clean, hassle-free install.
• Protective Premium Packaging: Shipped in reinforced, custom-fit packaging to prevent shipping damage and ensure your product arrives flawless.
• Designed to fit half size radiators, will not fit full size radiators

Vehicle Fitment:

• 1992–2000 Honda Civic (EG / EK w/ B-Series Swap)
• 1994–2001 Acura Integra (DC2)
• Pre-1965 Chassis w/ B-Series Swap

Why SPDZ1?

SPDZ1 performance headers are built with track-tested precision and enthusiast-driven engineering. We don’t cut corners — we raise the bar. When quality, fitment, and performance matter, SPDZ1 delivers.

As described in our Privacy Policy, we collect personal information from your interactions with us and our website, including through cookies and similar technologies. We may also share this personal information with third parties, including advertising partners. We do this in order to show you ads on other websites that are more relevant to your interests and for other reasons outlined in our privacy policy.

Sharing of personal information for targeted advertising based on your interaction on different websites may be considered "sales", "sharing", or "targeted advertising" under certain U.S. state privacy laws. Depending on where you live, you may have the right to opt out of these activities. If you would like to exercise this opt-out right, please follow the instructions below.

If you visit our website with the Global Privacy Control opt-out preference signal enabled, depending on where you are, we will treat this as a request to opt-out of activity that may be considered a “sale” or “sharing” of personal information or other uses that may be considered targeted advertising for the device and browser you used to visit our website.